package com.brillilab.common.utils;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.StringUtils;

import lombok.extern.slf4j.Slf4j;

/**
 * IP获取Util
 * @author LJ
 */
@Slf4j
public class IPUtil {	
	/**
	 * 获取IP
	 * @param request
	 * @return
	 */
	public static String getIpAddr(HttpServletRequest request) {
		String ipAddress = request.getHeader("x-forwarded-for");
		// ipAddress = this.getRequest().getRemoteAddr();
		if (StringUtils.isBlank(ipAddress) || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (StringUtils.isBlank(ipAddress) || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (StringUtils.isBlank(ipAddress) || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if (ipAddress.equals("127.0.0.1")) {
				// 根据网卡取本机配置的IP
				try {
					ipAddress = InetAddress.getLocalHost().getHostAddress();
				} catch (UnknownHostException e) {
					log.error(">>>>>>>  获取IP异常:{}", e);
					return "";
				}
			}
		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (StringUtils.isNotBlank(ipAddress) && ipAddress.length() > 15) { // "***.***.***.***".length() = 15
			if (ipAddress.indexOf(",") > 0) {
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		return ipAddress;
	}
}
